Allen-Bradley GuardShield Type 2 User manual

GuardShield™ Type 2
Safety Light Curtain
User Manual

Important User Information
Because of the variety of uses for the products described in this publication, those responsible for the
application and use of this control equipment must satisfy themselves that all necessary steps have been
taken to assure that each application and use meets all performance and safety requirements, including
any applicable laws, regulations, codes and standards.
Reproduction of the contents of this copyrighted publication, in whole or part, without written permission
of Rockwell Automation, is prohibited.
Throughout this manual we use notes to make you aware of safety considerations:
The illustrations, charts, sample programs and layout examples shown in the guide are intended solely for
purposes of example. Since there are many variables and requirements associated with any particular
installation, Rockwell Automation does not assume responsibility or liability (to include intellectual property
liability) for actual use based upon the examples shown in this publication.
Rockwell Automation publication SGI-1.1, Safety Guidelines for the Application, Installation and
Maintenance of Solid-State Control (available from your local Rockwell Automation sales oce), describes
some important dierences between solid-state equipment and electromechanical devices that should be
taken into consideration when applying products such as those described in this publication.
It is recommended that you save this user manual for future use.
Identifies information about practices or circumstances that can cause an explosion in
a hazardous environment, which may lead to personal injury or death, property
damage, or economic loss.
Identifies information that is critical for successful application and understanding of
the product.
Identifies information about practices or circumstances that can lead to personal
injury or death, property damage, or economic loss. Attentions help you identify a
hazard, avoid a hazard, and recognize the consequences.
SHOCK HAZARD
Labels may be on or inside the equipment (for example, drive or motor) to alert people
that dangerous voltage may be present.
BURN HAZARD
Labels may be on or inside the equipment (for example, drive or motor) to alert people
that surfaces may reach dangerous temperatures.
WARNING
IMPORTANT
ATTENTION

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Conditions required for proper use of the
GuardShield Type 2 Safety Light Curtain
Please make sure you read and understand these requirements before you select and install the
GuardShield Type 2 safety light curtain. GuardShield Type 2 safety light curtains are point of
operation safeguarding devices. These safety light curtains are intended to be used to provide point
of operation safeguarding of personnel on a variety of machinery.
GuardShield Type 2 safety light curtains are presence sensing devices and will not protect personnel
from heat, chemicals, or flying parts. They are intended to signal a stop of hazardous machine motion
when the sensing field is broken.
The GuardShield Type 2 family of safety light curtains are general purpose presence sensing devices
which are designed to protect personnel working on or near machinery.
It is the responsibility of the employer to properly install, operate and maintain the product as well
as the machinery on which the GuardShield Type 2 presence sensing device is installed.
The installation of GuardShield Type 2 safety light curtains must comply with all applicable federal,
state, and local rules, regulations, and codes.
GuardShield Type 2 safety light curtains must be properly installed by qualified personnel.
GuardShield Type 2 safety light curtains can only be used on machinery which can be stopped
anywhere in its stroke or cycle.
GuardShield Type 2 safety light curtains should never be used on full revolution clutched machinery.
The effectiveness of the GuardShield Type 2 safety light curtains depends upon the integrity of the
machine control circuit. The machinery on which the GuardShield Type 2 presence sensing device is
installed should have control circuitry that is fail safe in design.
All stopping mechanisms for the machinery should be inspected regularly to ensure proper operation.
The protected machinery must have a consistent reliable and repeatable stopping time.
ATTENTION Failure to read and follow these instructions can lead to misapplication or misuse
of the GuardShield Type 2 safety light curtains, resulting in personal injury and
damage to equipment.

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Table of Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Safety Precautions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Principles of Safe Use and Symbols Used . . . . . . . . . . . . . . . . . . 3
Specialist Personnel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Range of Uses of the Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Proper Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
General Protective Notes and Protective Measures . . . . . . . . .4
Product Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Light Curtain Principle of Operation . . . . . . . . . . . . . . . . . . . . . 4
Examples of Range of Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Response Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Determining the Safety Distance. . . . . . . . . . . . . . . . . . . . .6
US Safety Distance Formula . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OSHA Safety Distance Calculation Formula . . . . . . . . . . . . . . 6
The ANSI Safety Distance Formula . . . . . . . . . . . . . . . . . . . . . . 6
European Safety Distance Formula . . . . . . . . . . . . . . . . . . . . . . . 6
Installation and Mounting . . . . . . . . . . . . . . . . . . . . . . . . . .8
Correct Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Incorrect Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Multiple GuardShield Type 2s . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Mounting Brackets. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
Typical Wiring Diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Troubleshooting Guide. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
Checklist. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Safety Instructions—Maintenance . . . . . . . . . . . . . . . . . 14
Daily Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
Six-month Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Date Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Type 2 Catalog Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Rockwell Automation reserves the right to make changes or revisions to
the material contained in this publication and cannot be held liable for
incidental or consequential damages resulting from the furnishing,
performance or use of this material.
IMPORTANT
Save these instructions for use at a future
time.
Generally recognized technical regulations and quality
assurance system ISO 9000 are carefully applied during
the development and production of Allen-Bradley/
Guardmaster products.
This technical description must be followed when
installing and commissioning the GuardShield Type 2.
Inspection and commissioning must be carried out by a

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GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Introduction
The GuardShield Type 2 safety light curtain is a general purpose
presence sensing device, designed for use on hazardous machinery
providing point of operation, as well as, perimeter and access detection.
It is a self-contained, two box, Type 2 ESPE (Electro Sensitive Protective
Equipment).
The GuardShield Type 2 is offered in either guard only mode or with a
restart interlock and EDM.
Safety Precautions
Principles for Safe Use and Symbols Used
The following instructions are preventive warnings for the proper
operation of the GuardShield Type 2. These instructions are an essential
part of the safety precautions and therefore have to be observed at any
time.
Throughout this manual we use the labels ATTENTION and
IMPORTANT to alert you to the following:
Failure to observe may result in dangerous operation
ATTENTION: Identifies information about
practices of circumstances that can lead to personal injury or death,
property damage, or economic loss.
AT T E NT I O N h elp s y ou
•Identifyahazard
•Avoidahazard
• Recognize the consequences
IMPORTANT: Identifies information that is especially important for
successful application and understanding of the product.
The GuardShield Type 2 may be used in safety applications in which a
risk analysis according to ANSI TR.3, ANSI/RIA 15.06, pr EN 1050 or
EN 959-1 have reached Category 2.
Specialist Personnel
The GuardShield Type 2 safety light curtain must be installed,
commissioned and serviced only by a qualified person. A qualified
person is defined as a person who:
• Has undergone the appropriate technical training
and
• Who has been instructed by the responsible machine operator in
the operation of the machine and the currently valid safety
guidelines
and
• Who has read and has ongoing access to these installation
instructions
IMPORTANT
These installation instructions are designed
to address the technical personnel of the
machine manufacturer and or the installer of
the safety system regarding the proper
mounting, configuration, electrical
installation, commissioning, operation and
maintenance of the GuardShield Type 2
safety light curtain.
These installation instructions do not provide
instruction for the operation of machinery to
which the GuardShield Type 2 safety light
curtain is, or will be, integrated. Only
qualified personnel should install this
equipment.
ATTENTION
ATTENTION
Potentially hazardous situation, which, if not
prevented, might lead to serious or deadly
injury.
Failure to observe may result in dangerous
operation.
ATTENTION
The GuardShield Type 2 must not be used
with machines that cannot be stopped
electrically in an emergency.
The safety distance between the GuardShield
Type 2 and a dangerous machine movement
maintained at all times.
Additional mechanical protective devices have to be
installed in a way that hazardous machine elements cannot
be reached without passing through the protective field.
The GuardShield Type 2 has to be installed in a way that
operators can only operate within the sensing area.
Improper installation can result in serious injury.
Never connect the outputs to +24V DC. If the outputs are
connected to +24V DC, they are in ON-state and cannot stop
hazardous spots at the machine/application.
Never expose the GuardShield Type 2 to flammable or
explosive gases.
Regular safety inspections are imperative (see maintenance).
Do not repair or modify the GuardShield Type 2. The
GuardShield Type 2 safety light curtain is not field repairable
and can only be repaired at the factory. Removal of either of
the GuardShield Type 2 endcaps will void the warranty terms
of this product.

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Range of Uses of the Device
The GuardShield Type 2 safety light curtain is classified as electro-
sensitive protective equipment (ESPE). The physical resolution is 30 mm
(1.18 in.). The maximum protective field width is 18 m (59 ft) for the 30
mm (1.18 in.) resolution GuardShield Type 2. The protective field
height is between 160 mm (6.3 in.) and 1760 mm (69.2 in.).
The device is a Type 2 ESPE as defined by IEC 61496-1 and CLC/TS
61496-2 and is therefore allowed for use with controls in safety category
Type 2 in compliance with EN ISO 13849, SIL CL2 in accordance with
EN62061 or up to PLd in accordance with EN ISO 13849. The device is
suitable for:
• Point of operation protection (finger and hand protection)
• Hazardous area protection
• Access protection
Access to the hazardous point must be allowed only through the
protective field. The machine/system is not allowed to start as long as
personnel are within the hazardous area. Refer to the “Examples of
Range of Use” on page 5 for an illustration of the protection modes.
Depending on the application, mechanical protection devices may be
required in addition to the safety light curtain.
Proper Use
The GuardShield Type 2 safety light curtain must be used only as
defined in the “Range of Uses of the Device.” It must be used only by
qualified personnel and only on the machine where it has been installed
and initialized by qualified personnel.
If the device is used for any other purposes or modified in any way,
warranty claims against Allen-Bradley/Guardmaster shall become null
and void.
General Protective Notes and Protective Measures
• The national/international rules and regulations apply to the
installation, use and periodic technical inspections of the safety
light curtain, in particular:
♦Machine Directive 2006/42/EC
♦Low Voltage Directive 2006/95/EC
♦Use of Work Directive 2009/104EC
♦The work safety regulations/safety rules
♦Other relevant health and safety regulations
Manufacturers and users of the machine with which the safety light
curtain is used are responsible for obtaining and observing all
applicable safety regulations and rules.
• The notices, in particular the test regulations of these installation
instructions (e.g. on use, mounting, installation or integration into
the existing machine controller) must be observed.
• The tests must be carried out by specialist personnel or specially
qualified and authorized personnel and must be recorded and
documented to ensure that the tests can be reconstructed and
retraced at any time.
• The installation instructions must be made available to the user of
the machine where the GuardShield Type 2 safety light curtain is
installed. The machine operator is to be instructed in the use of
the device by specialist personnel and must be instructed to read
the installation instructions.
Product Description
This section provides information on the special features and properties
of the safety light curtain. It describes the structure and functions of the
unit, in particular the different operating modes.
→Please read this section before mounting, installing and
commissioning the unit.
GuardShield Type 2 Light Curtain
Principle of Operation
The GuardShield Type 2 safety light curtain consists of a non-matched
pair of optic units, i.e., transmitter and receiver with the same protected
height and resolution. The transmitter and receiver operate on +24V
DC. The maximum distance between transmitter and receiver is referred
to as the protective field width or range. The protective field height is the
distance between the first and last beam in the device.
The transmitter emits sequential pulses of infrared light which are
received and processed by the GuardShield Type 2 receiver. The
synchronization of the timing of the emission and reception of infrared
light pulses is accomplished optically by the first beam adjacent to the
GuardShield Type 2 status LEDs. This beam is referred to as the
synchronization beam. Because the GuardShield Type 2 transmitter and
receiver are optically synchronized, no electrical connection is required
between the transmitter and receiver.
The GuardShield Type 2 receiver has two safety outputs, Output Signal
Switching Devices (OSSDs) and one nonsafety auxiliary output. When
the GuardShield Type 2 transmitter and receiver are properly powered
and aligned, all OSSDs are current sourcing +24V DC with a switching
capacity of 500mA. The two safety OSSDs are cross monitored and
short-circuit protected. Interruption of the sensing field causes the
receiver to switch the sourced current OFF (0V DC).
Restoring the GuardShield Type 2 sensing field, (in Guard only
configuration) causes all outputs (OSSDs) to switch to the active high
state (resume current sourcing +24V DC with a switching capacity of
500mA).
The GuardShield Type 2 Light Curtain
The GuardShield Type 2 safety light curtain consists of a transmitter and
a receiver.
ATTENTION
Safety Notes
Please observe the following items in order to
ensure compliance of the proper and safe use
of the GuardShield Type 2 safety light curtain.

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GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Figure 1: Components of the GuardShield Type 2
The upper and lower limit of the protective field is shown by markings
on the housings.
The width of the protective field is derived from the length of the light
path between sender and receiver and must not exceed the maximum
rated width of the protective field (18 m…30 mm (59.0ft…1.18in.)).
Examples of Range of Use
The GuardShield Type 2 safety light curtain operates as a proper
protective device only if the following conditions are met:
• The control of the machine must be electrical.
• The controlled machine must be able to be stopped any where in
the machines stroke or cycle.
• The transmitter and receiver must be mounted such that access to
the hazard is only through the light curtain’s protective field.
• The restart button must be located outside the hazardous area
such that it cannot be operated by a person working inside the
hazardous area.
• The statutory and local rules and regulations must be observed
when installing and using the device.
Guard Only
When in the guard only mode of operation, the light curtain operates as
an on/off device, meaning the OSSD outputs switch off/on according to
an obstruction or clearing of the detection field.
Start Interlock
The start interlock is designed to protect against the OSSD outputs from
switching to ON state after power up of the system with the protective
field unobstructed. A manual reset of the system is required for the
GuardShield Type 2 to enter the ON state.
This can be accomplished by one of two methods.
• Actuation of a momentary N.O. push button
• Interruption and restoration of the protective field within one
second.
GuardShield Type 2 is factory ordered with this functionality. Indication
of this mode of operation is through illumination of a yellow LED on the
GuardShield Type 2 receiver.
Restart Interlock
The restart interlock mode of operation is designed to protect against the
OSSD outputs from switching to ON after interruption and clearance of
the protective field. A manual reset of the GuardShield Type 2 system is
required. Resetting of the system is accomplished through a momentary
N.O. push button or key switch. The restart interlock mode is indicated
by the illumination of a yellow LED on the GuardShield Type 2 receiver.
GuardShield Type 2 is factory ordered with this functionality.
Relay Monitoring (MPCE/EDM)
The relay monitoring function is an input signal to the GuardShield
Type 2 receiver and is used to monitor the state of the protected
machinery’s primary control contactors or other final switching device.
Detection of unsafe conditions such as welded contacts, cause the
GuardShield Type 2 to enter a lockout condition (OSSDs OFF).
System Testing
The GuardShield Type 2 performs a complete system self-test at power
up and switches to the ON state if the system is properly aligned and the
protective field is unobstructed. If the start/restart interlock version is
used, a reset is required to switch to a “green” state.
External Test (Machine Test Signal)
A test cycle of the system can be triggered by an external test signal to the
GuardShield Type 2 transmitter. Supplying or removing a signal (+24V
DC) via a N.C. or N.O. switch at the test input deactivates the
transmitter for the duration of the test signal, simulating an interruption
of the protective sensing field.
Response Time
The response time of the GuardShield Type 2 safety light curtain
depends on the height of the protective field, the resolution and the
number of light beams as well as the coding of the system.
IMPORTANT
Additional measures may be necessary to
ensure that the ESPE does not fail to danger
when other forms of light radiation are
present in a particular application (i.e., use of
cableless control devices on cranes, radiation
from weld spatter or effects from strobe
lights).
IMPORTANT
The protective system must be tested for
proper operation after each and every
change to the configuration.
Resolution [mm
(in.)]
Protective
Height [mm
(in.)]
Number of
Beams
Response Time
w/o Coding
Response Time
w/Coding
30 (1.18) 160 (6.3) 8 20 ms 30 ms
30 (1.18) 320 (12.5) 16 20 ms 30 ms
30 (1.18) 480 (18.8) 24 20 ms 30 ms
30 (1.18) 640 (25.1) 32 20 ms 30 ms
30 (1.18) 800 (31.4) 40 20 ms 30 ms
30 (1.18) 960 (37.7) 48 20 ms 30 ms
30 (1.18) 1120 (44.0) 56 20 ms 30 ms
30 (1.18) 1280 (50.3) 64 20 ms 30 ms
30 (1.18) 1440 (56.6) 72 20 ms 30 ms
30 (1.18) 1600 (62.9) 80 20 ms 30 ms
30 (1.18) 1760 (69.2) 88 20 ms 30 ms

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Determining the Safety Distance
The light curtain must be mounted with proper safety distance
• From the point of danger
• From reflecting surfaces
US Safety Distance Formula
This distance, referred to as the safety distance, must be properly
calculated prior to determining the safety light curtain protective height
and mounting the light curtains on the machine. Failure to properly
calculate this safety distance may result in operator injury.
In the United States there are two formulas that are used to properly
calculate the safety distance. The first, the OSHA formula, is the
minimum requirement for the calculation of the safety distance. The
second formula, the one recommended by Rockwell Automation, is the
ANSI formula, which incorporates additional factors to be considered
when calculating the safety distance.
OSHA Safety Distance Calculation Formula
The OSHA safety distance formula as specified in CFR Subpart O
1910.217 is as follows:
Ds = 63 X TS
Ds Safety Distance
63 Is the OSHA recommended hand speed constant in inches
per second
Ts Is the total stop time of all devices in the safety circuit,
measured in seconds. This value must include all
components involved in stopping the hazardous motion of
the machinery. For a mechanical power press it is the
stopping time measured at approximately the 90º position of
the crankshaft rotation.
Note: The TSnumber must include the response times of all
devices, including the response time of the safety light
curtain, the safety light curtain controller (if used), the
machine’s control circuit and any other devices that react to
stop the hazardous motion of the machinery. Not including
the response time of a device or devices in the stop time
calculation will result in insufficient safety distance for the
application. This may result in operator injury.
The ANSI Safety Distance Formula
The ANSI safety distance formula, which is the Rockwell Automation
recommended formula, is as follows:
DS= K x (TS+ TC+ Tr+ Tbm) + Dpf
Ds Minimum safety distance between the safe guarding device
and the nearest point of operation hazard, in inches.
K Hand speed constant in inches per second. The ANSI
standard value is 63 inches per second when the operator
begins reaching toward the point of operation hazard from
rest. NOTE: ANSI B11.19 1990 E4.2.3.3.5 states “The
value of the hand speed constant, K, has been determined
by various studies and although these studies indicate speeds
of 63 inches/second to over 100 inches/second, they are
not conclusive determinations. The employer should
consider all factors, including the physical ability of the
operator, when determining the value of K to be used.”
Ts Stop time of the machine tool measured at the final control
element.
Tc Response time of the control system
Note: Tsand Tcare usually measured by a stop time measuring
device.
Tr Response time of the presence sensing device (safety light
curtain) and its interface, if any. This value is generally stated
by the device manufacturer or it can be measured by the
user.
Tbm Additional time allowed for the brake monitor to
compensate for variations in normal stopping time.
Dpf Depth penetration factor. It is an added distance to allow
for how far into the protective field an object, such as a
finger or hand, can travel before being detected. Dpf is
related to the safety light curtain’s object sensitivity. Object
sensitivity is the smallest diameter object which will always
be detected anywhere in the sensing field.
European Safety Distance Formula
A safety distance must be maintained between the light curtain and the
point of danger. This safety distance helps ensure that the point of danger
can only be reached after the dangerous state of the machine has been
completely removed.
The safety distance as defined in EN ISO 13855 and EN ISO 13857
depends on:
• Stopping/run-down time of the machine or system. (The
stopping/run-down time is shown in the machine documentation
or must be determined by taking a measurement.)
• Response time of the protective device, e.g. GuardShield Type 2
(for “Response Time” see page 5).
• Reach or approach speed.
Determining Stop Time: The measurement of
stopping time (Ts) must include the stopping
times of all devices in the stop circuit. Not
including all device and control system
elements when calculating Ts will result in an
inaccurate safety distance calculation.
IMPORTANT
ATTENTION
The GuardShield Type 2 safety light curtains
must be mounted at a sufficient distance
from the pinch point or point of operation
hazard to ensure that the machine stops
before a person’s finger, hand, arm(s), or
Regardless of the calculated safety distance,
GuardShield Type 2 safety light curtains
should never be mounted closer than six
inches from the point of operation or pinch
IMPORTANT

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GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
• Resolution of the light curtain and/or beam separation.
Figure 2: Safety distance from the point of danger
How to Calculate the Safety Distance S
According to EN ISO 13855 and EN ISO 13857:
→First, calculate S using the following formula:
S = 2000 × T + 8 × (d – 14) [mm]
Where …
T = stopping/run-down time of the machine
+ response time of the protective device [s]
d = resolution of the light curtain [mm]
S = safety distance [mm]
The reach/approach speed is already included in the formula.
→If the result S is ≤500 mm (19.6 in.), then use the
determined value as the safety distance.
→If the result S is > 500 mm (19.6 in.), then recalculate S as
follows:
S=1600×T+8×(d–14)[mm]
→If the new value S is > 500 mm (19.6 in.), then use the newly
determined value as the minimum safety distance.
→If the new value S is ≤500 mm (19.6 in.), then use 500 mm
(19.6in.) as the safety distance.
Example:
Stopping/run-down time of the machine = 290 ms
Response time = 30 ms
Resolution of the light curtain = 30 mm (1.18 in.)
T = 290 ms + 30 ms = 320 ms = 0.32 s
S = 2000 × 0.32 + 8 × (30 – 14) = 768 mm (30.24 in.)
S > 500 mm, therefore:
S = 1600 × 0.32 + 8 × (30 – 14) = 640 mm (25.1 in.)
Example:
In opto-electronic safeguarding, such as with a perpendicular safety light
curtain applications with object sensitivity (effective resolution) less than
2.5 inches, the Dpf can be approximated based on the following formula:
Dpf (inches) =3.4 × (Object Sensitivity – 0.276),
but not less than 0.
Minimum Distance from Reflecting Surfaces
The infrared light from the sender may be reflected off of shiny surfaces
and be received by the system’s receiver. If this condition occurs, it can
result in an object not being detected when it enters the GuardShield
Typ e 2 sensing field .
All reflecting surfaces and objects (e.g. material bins) must therefore be
located at a minimum distance afrom the protective field of the system.
The minimum distance adepends on the distance Dbetween sender and
receiver.
Figure 3:
Minimum distance from reflecting surfaces
How to Determine the Minimum Distance from the
Reflecting Surfaces:
→Determine the distance D[m] sender-receiver
→Read the minimum distance a[mm] from the graph:
Figure 4:
Graph, minimum distance from reflecting surfaces
Safety distance S (Ds)
Protective field height Point
Distance to avoid standing behind
of
danger
the safety curtain ≤75mm
a
Distance D (meters)
1600
1500
51520310
a (mm)
800
100
900
300
1000
200
1100
400
1200
500
1300
600
1400
700
D (m)

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
8
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Original instructions
The effective aperture angle for the GuardShield Type 2 system is within
±5.0° at a mounting distance of > 3.0 m (9.8 ft). Calculate the minimum
distance to reflecting surfaces depending on the distance between the
transmitter and the receiver, using an aperture angle of ±5.0°, or take the
appropriate value from the following table:
Note: Formula: a = tan 2.5° x D [mm]
a = minimum distance to reflecting surfaces
D = distance between transmitter and receiver
Installation and Mounting
This section describes the preparation, selection and installation of the
GuardShield Type 2 safety light curtain.
The standard GuardShield Type 2 has an amber LED in the receiver
which is used as an alignment aid. This LED will begin flashing when the
infrared light from the transmitter is “seen” by the receiver. This LED
turns off when optimal alignment is attained.
Alignment Procedure: Standard GuardShield Type 2
Mount and connect both transmitter and receiver. They must be parallel
to each other and be positioned at the same height.
Turn on power to GuardShield Type 2 system.
Rotate the transmitter while watching the amber LED on the receiver to
find the point where the indicator for the ON state (Green LED)
illuminates and the amber LED goes off.
Determine the maximum left and right turning angles and position unit
in center. Tighten all hardware assuring that the alignment indicator is
not illuminated.
Cycle power to assure that the system powers up and goes to the ON
state (alignment indicator is OFF).
An external laser (440L-ALAT) and mounting bracket (440LAF6109)
is offered as an accessory for aligning the GuardShield Type 2.
The GuardShield Type 2 safety light curtain is suitable for most
operating environments (IP65 environmental rating). Proper safety
distance as well as adequate protective height must be observed.
Determine if the machinery, on which the GuardShield Type 2 is to be
mounted, meets the requirements as specified in the beginning of this
manual, i.e., machinery must be able to be stopped anywhere in its stroke
or cycle, consistently and repeatedly.
Correct Installation
Incorrect Installation
The GuardShield Type 2 must be mounted at the proper distance from
the point of operation hazard. This distance is referred to as the Safety
Distance.
Distance Between Transmitter and Receiver
(Range X)D[m (ft)]
Minimum Distance
a [mm (in.)]
0.2…3.0 (0.65…9.8) 263 (10.4)
4.0 (13.1) 350 (13.8)
5.0 (16.4) 437 (17.2)
6.0 (19.6) 525 (20.7)
7.0 (22.9) 613 (24.1)
10.0 (32.8) 875 (34.5)
16.0 (52.4) 1400 (55.1)
18.0 (59.1) 1575 (62.0)
The installation of the GuardShield Type 2
safety light curtain must be such that access
to the hazard is only possible through the
sensing field of the GuardShield Type 2.
Auxiliary safe guarding may be required in
conjunction with the GuardShield Type 2 to
meet this requirement.
IMPORTANT
Operators cannot reach hazardous
machine parts without passing through
the protective field.
Operators must not step between
protective field and hazardous machine
parts (by-pass prevention).
Operators can reach hazardous machine
parts without passing through the
protective field.
Operators can step between protective
field and hazardous machine parts.

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GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Figure 5: Determining machine stopping time and safety distance
Multiple GuardShield Type 2
When two or more GuardShield Type 2 are mounted in close proximity
to one another, it may be possible for the receiver of one GuardShield
Type 2 pair to receive infrared light from the transmitter of another
GuardShield Type 2 pair. If two or more pair of GuardShield Type 2 are
mounted in the same plane, the transmitter and receiver pairs must be
mounted in accordance with Figure 6 or a barrier is used to guard against
optical interference.
Figure 6:
Multiple GuardShield Type 2 alignment options
Mounting Brackets
The GuardShield Type 2 is mounted using right angle brackets attached
to the endcaps of both transmitter and receiver. It may be necessary to use
additional brackets to mount the GuardShield Type 2 at a proper safety
distance from the machinery hazard.
Figure 7:
Mounting brackets
Optional Middle Mounting Bracket (440L-AF6108)
Figure 8:
Note: Middle mounting brackets should be used in vibration
applications for protective heights of 1120 mm and larger.
Middle of Depth of Protective Field
Safety Distance Point of Operation
Top of tool
Bottom of tool
To avoid the possibility of
standing between the protective
field and the point of operation,
the distance must be maintained.
Protective Field Marking
Machine stop time
Transmitters emit in opposite
direction. Each receiver receives only
the beams of the appropriate
transmitter.
Positioning of the light curtain:
Transmitters emit in opposite
direction.
42
(1.65)
20
(0.79)
40 (1.57)
18.9
14.5
52 (2.04)
3.0
32
(1.25)
6.5 (0.26)
49.2 (1.93)
40.2
62
24
30 (1.18)
20 (0.78)

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Original instructions
Electrical Installation
Connections
Power Supply
The external voltage supply (+24V DC) must meet the requirements of
IEC 61496-1. In addition, the following requirements have to be
fulfilled:
• A short-term power failure of 20 ms must be bridged by the power
supply.
• The power supply has double insulation between the primary and
the secondary side.
• The power supply is protected against overload.
• The power supply corresponds to the guidelines of the EWG
(industrial environment).
• The power supply corresponds to the Low Voltage Directives.
• The grounded conductor of the power supply device must be
connected to a grounded conductor PE.
• The maximum deviation of the voltage levels is 24V DC +/- 20%.
EDM Connection
Figure 9: Connecting the contact elements to the EDM
Start/Restart interlock
Note: Start/restart interlock requires a N.O. momentary push button or
key switch.
Figure 10: Connecting the reset button/restart button
Connections [mm (in.)]
Cables/Connectors
The GuardShield Type 2 transmitter connector is a four-pin DC micro
connector offered in cable lengths from 2 to 30 meters. The GuardShield
Type 2 receiver connector is an 8-pin DC micro connector offered in
cable lengths of 2 to 30 meters.
Standard GuardShield Type 2 Receiver Connector
Double insulation This part of the insulation provides
supplementary insulation against
hazardous voltage levels.
Motor, etc.
Hazardous voltage level
Basic insulation
HazardousHazardous
Reinforced
insulation or
double
Unit 1
Power
SupplyUnit
Output (pink Basic insulation
Basic insulation
0V (blue)
+24V (brown) K1 K1 K2 K2
GuardS
hield
24V Pin 4 5
6
K1
K2
k2 k1
Contactor Contacts
Contactor
Coils
Transmitter Connection
Face View of
Female DC Micro Color Pin No.
Signal
Transmitter
Brown 1 +24V DC
White 2 No Connection
Blue 3 0V DC
Black 4 Machine Test Signal
Receiver Connection
Face View of
Female DC Micro Color Pin No.
Signal
Receiver
White 1 Auxiliary Output
Brown 2 +24V DC
Green 3 Ground
Yellow 4 EDM
Grey 5 OSSD 1
Pink 6 OSSD 2
Blue 7 0V DC
Red 8 Start/Restart
Pin 8
Reset/restart button
24V
14
32
2
15
8
76
4
3

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Typical Wiring Diagram (Direct to contactors if GuardShield Type 2 with start/restart interlock and EDM is factory ordered)
➊Nonsafety auxiliary output can be connected to a lamp, motor or status to a PLC.
Note: If MPCE/EDM is not used, the GuardShield Type 2 OSSDs should be connected to a safety relay module, which is configured for EDM.
Typical Wiring Diagram—To MSR127 Safety Relay Module
M
+ 24VDC
24V Ground
SENDER
OSSD 1
OSSD 2
RECEIVER
K1
Bulletin 100S
Safety Contactors
or 700S Safety Relays
K2
L1 L3L2
Gray
Pink
Green
Blue
Blue
Yellow
Brown
Brown
S2
Start/Restart
Red
MPCE/EDM
S1
Test
Black
Machine
Test
Signal
White
Auxiliary
Signal
+24V
3
1
AS12S52
K4
Transmitter 72 Receiver
L1
K5
OSSD2OSSD1
65
13 3323 41
A2 S22S21 14 3424 42S34
L2 L3
K4
K5
K4 K5
DC Common
Reset
MSR127RP
M
ATTENTION
The GuardShield Type 2 is a Type 2 safety
device. The use of a Category 4 safety relay in
a safety circuit will not increase the safety
level of the safety circuit above a Category 2.

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Troubleshooting Guide
The light curtain carries out an internal self-test after startup. If an error
occurs, an appropriate signal combination is sent through the LEDs to
the transmitter and receiver.
Condition
No. Error Description Action
6Internal fault, receiver • Replace receiver
7
Internal fault, transmitter • Check connections transmitter/
receiver
• Exchange transmitter
8
External fault • Check connections of OSSD
outputs for short circuit against
+24V DC and GND (cable,
connected devices)
•Replacereceiver
9
External fault (MPCE error)
The function Relay monitoring is
activated and after clearing the OSSD
the input Relay monitoring does not
recognize a change of state.
• Check connection Relay
monitoring
• Check connected relay for closed
contact (if OSSD ON—input Relay
monitoring must have GND level,
if OSSD OFF—input Relay
monitoring must have +24V)
• Switch on only after POWER OFF/
ON

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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System Status Indicators
6 through 9 = Fault conditions
Flash rate is approximately. 2 Hz (2 times per second)
Note: For fault conditions 6 through 9, see Troubleshooting guide on page 12.
Receiver LEDs Transmitter LEDs
Condition No.
OSSDs
OFF
Red
OSSDs
ON
Green
Alignment
Amber
Interlock
Yellow
Power
On
Amber
Emitting
Yellow
1 OFF ON OFF OFF ON ON
2 ON OFF OFF OFF ON ON
3ONOFFONOFFONON
4ONOFFOFFONONON
5 ON OFF OFF OFF ON OFF
6FLASH OFF OFF OFF ON ON
7ON OFF OFF OFF FLASH ON
8FLASH OFF ON OFF ON ON
9FLASH OFF OFF ON ON ON
Condition No. Description
1Guard only mode, light curtain unobstructed (aligned, not in interlock)
2Guard only mode, light curtain interrupted (aligned, not in interlock)
3Guard only mode, misaligned (not in interlock)
4Restart interlock (aligned)
5Transmitter test input active (pin 4)
6Internal fault, receiver
7Internal fault, transmitter
8External fault (OSSD short to ground, +V, or cross connection)
9External fault (MPCE/EDM error)
Receiver Transmitter
OSSDs
OFF
Power Emitting
OSSDs
ON
Alignment Interlock

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Checklist
Before the initiation of the GuardShield Type 2 the responsible person
should work through the following checklist.
Cable check prior to initiation:
Switch the GuardShield Type 2 on and check its function by observing
the following:
Safety Instructions—Maintenance
Note:
1. For safety reasons all inspection results should be
recorded.
2. Only persons, who clearly understand the functioning of the
GuardShield Type 2 and of the machine, may carry out an
inspection.
3. If installer, planning engineer and operator are different people,
make sure that the user has sufficient information available to carry
out the inspection.
Daily Inspection
Operate the machine and check, if the hazardous movement will stop
under the following circumstances.
1. The power supply is solely connected to the GuardShield Type 2.
2. The power supply is a 24V DC device, that must comply to all
applicable standards of the Machinery Directive 2006/42/EC,
and the product standard (IEC 61496).
3. Proper polarity of the power supply at the GuardShield Type 2.
4. The transmitter connection cable is properly connected to the
transmitter, the receiver connection cable is properly connected
to the receiver.
5. The double insulation between the light curtain output and an
external potential is ensured.
6. The OSSD outputs are not connected to +24V DC.
7. The connected switching elements (load) are not connected to
24V DC.
8. No connection to a conventional power supply.
9. If two or more GuardShield Type 2 are to be used, make sure that
each system is properly installed, in order to avoid optical
interference.
10. Two seconds after switching on, the system starts to work
properly, if the protective field is free of obstructions.
ATTENTION
Assure that all power to the machine, and
safety system is disconnected during
electrical installation.
Prior to powering up the GuardShield Type 2
system, the responsible person should
review the following Checklist.
IMPORTANT
1. Approach to hazardous machine parts must only be possible
through passage through the protective field of GuardShield Type
2.
2. Operators cannot step through the sensing area while working on
dangerous machine parts.
3. The safety distance of the application is bigger than the calculated
value.
4. The optic front cover is neither scratched nor dirty.
5. The protective field is interrupted.
6. Hazardous machine movement stops immediately, if the
protective field is interrupted by the test rod directly in front of
the transmitter, directly in front of the receiver and in the middle
between transmitter and receiver.
7. No hazardous machine movement while the test rod is anywhere
within the protective field.
8. The power supply of the GuardShield Type 2 is turned off.
9. If the blanking function is activated, check all sections of the
protective field with the appropriate test piece.
Never operate the GuardShield Type 2 before
carrying out the following inspection.
Improper inspection can lead to serious or
even deadly injury.
ATTENTION
If any of the above conditions do not result in
the hazardous motion of the machine
ceasing, do not allow the protected machine
to be placed in operation.
IMPORTANT

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GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Proper testing of protective field using test rod
Six-Month Inspection
Check the following items every six months or whenever a machine
setting was changed.
Cleaning
If the optic front cover of the GuardShield Type 2 is dirty, the outputs of
the GuardShield Type 2 turn off. Take a clean, soft cloth and rub without
pressure. Do not apply aggressive, abrasive or scratching cleansing agents,
which might attack the surface.
Date Code
Explanation of data code
1. Machine stops or does not obstruct any safety function.
2. The latest machine or connection modifications have no effect on
the control system.
3. The outputs of the GuardShield Type 2 are properly connected to
the machine.
4. The total response time of the machine is shorter than the
calculated value.
5. Cables and plugs of the GuardShield Type 2 are in flawless
condition.
6. Mounting brackets, caps and cables are tightly secured.
Transmitter
Receiver
Location of Manufacture Year of Manufacturer Week of Manufacturer
XX*XX
M or 4K R 02
M represented Manchester, NH replaced by 4K for Monterrey, Mexico
* J=2004
K=2005
L=2006
M=2007
N=2008
P=2009
R=2010
S=2011
T=2010
U=2013
V=2014
W=2015
Y=2016
Z=2017
Part No.
GuardShield
TM
PLD/SIL CL2,SIL2
Response Time w/o Coding
Protective Height
Range
Resolution
2 Executive Dr. Chelmsford MA. 01824
Product of Mexico
978-441-9500
Ser
Rev
T2KA0320YD AA
Ser
Rev
440L
Bul/Type
Part No.
T2KA0320YD AA
AA00AA00
Ambient Temp
Power Consumption
Supply Voltage
Safety Parameters
Operating Instructions
Ref No.
Jun, 2010
PN-20857
7W max.
IP65
30mm
0.3-16m
320mm
<30ms
<20ms
-10.....+55C
24V DC +/-20%
Bul/Type
Response Time with Coding
Electro-Sensitive
Protective Equip.
19KP
Degree of Protection
Rockwell Automation
440L
IEC61496/ EN ISO 13849
EN62061/ IEC61508
Type 2/Cat.2
Made in

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Technical Specifications
Light Beams 8 – 88
Protective Field 160…1760 mm (6.3…69.29 in.) in 160 mm (6.3 in.) increments
Resolution 30 mm (1.18 in.)
Range 30 mm (1.18 in.); 0.3…18.0 m (0.98…59.0 ft)
Response Time OSSD – ON to OFF: (Reaction times); 20…25 ms
Power Supply 24V DC +/-20%; Power supply must meet the requirements of IEC 60204-1 and IEC 61496-1.
Power Consumption 400 mA max. (unloaded)
IR Transmitter Infrared LED (wave length 870 nm)
Aperture Angle Within ± 5.0° for transmitter and receiver
Operating Condition IR transmitter ON
Functions Guard Only: On/Off operation with clear/obstructed detection area
Start Interlock: Interlock at start up—Reset by actuation of momentary N.O. pushbutton switch (or
interruption/restoration of light curtain)
Restart Interlock: Interlock at interruption of sensing field—Reset by actuation of momentary N.O.
pushbutton switch
Relay Monitoring: Monitoring a switch contact of the installation
Test Function: Triggering of system test via external switch
Inputs Transmitter Machine Test Signal Minimum duration 100 ms
Voltage level for Logic 0: 0…5V DC Voltage level for Logic Hi 1: > 16V DC
Inputs Receiver Start/Restart Interlock Logic Lo
Minimum duration 100 ms; maximum duration 900 ms
Voltage level for Logic Lo 0: 0…5V DC Voltage level for Logic Hi 1: > 16V DC
MPCE 300 ms after activation of OSSD
Voltage level for Logic 0: 0…5V DC Voltage level for Logic Hi 1: > 16V DC
Outputs: Safety Outputs (OSSDs)
Auxiliary Output
2 solid state outputs, max. switching capacity 500 mA, short circuit protected, max. residual voltage 2V (excl. voltage drop
through cables)
Solid state output, max. power consumption 500 mA, max. residual voltage 2V—nonsafety output
Status Indicators Receiver ON-state
OFF-state
Alignment
Interlock
Constant ON when system is in ON-state (green LED)
Constant ON when system is in OFF-state (red LED)
• Lights up at interruption of protective field or if fault occurs
Lights up, if input signal is too weak (amber LED)
Lights up when light curtain is in start or restart interlock mode (yellow LED)
Status Indicators Sender Power ON
Emitting Lights up, when voltage is on (amber LED) Constant ON when transmitter is active (yellow LED)
QD Connectors Transmitter: M12 plug 4 pin; receiver: M12 plug 8 pin
Cable Length Maximum 30 m (100 ft)
Ambient Temperature During operation: –10…55°C (14…131°F); For storage: –25…75°C (-13…167°F)
Humidity of the Air Up to 95% (without condensation) between 20°C and 55°C (68°F and 131°F)
Enclosure Rating IP65
Vibration Resistance Per IEC 61496-1, IEC 60068-2-6 Frequency 10…55 Hz Amplitude 0.35 mm
Shock Per IEC 61496-1, IEC 60068-2-29 Acceleration 10 g, Duration 16 ms
Material Housing: Aluminum; Cover: PMMA (acrylic)
Dimensions (cross section) Approx. 40 x 50mm (1.57 x 1.96 in.)
Accessories Included Test rod, mounting brackets, operating instructions
Approvals IEC 61496 Parts 1and 2, UL 61496 Parts 1 and 2, UL 1998
Safety Classification Type 2 per EN/IEC 61496, Category 2 EN/ISO 13849, SIL 2, IEC 61508, SIL CL2, EN 62061, PLd, EN/ISO 13849
PFHd (mean probability of a dangerous failure/hr Standalone sys.: 9.51 x 10-9
TM(mission time) 20 years (EN ISO 13849)
Transmitter Wave Length 870 nm

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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GuardShield Type 2 Catalog Numbers
Catalog Number Explanation
Sensor Pair Transmitter Receiver Resolution—mm (in) No. of Beams
Protective
Heights—
mm (in)
Pair Weight— kg
(lbs)
440L-P2K⊗0160YD 440L-T2KA0160YD 440L-R2K⊗01604D 30 (1.18) 8 160 (6.2) 0.9 (1.9)
440L-P2K⊗0320YD 440L-T2KA0320YD 440L-R2K⊗0320YD 30 (1.18) 16 320 (12.59) 1.1 (2.4)
440L-P2K⊗0480YD 440L-T2KA0480YD 440L-R2K⊗0480YD 30 (1.18) 24 480 (18.89) 1.6 (3.5)
440L-P2K⊗0640YD 440L-T2KA0640YD 440L-R2K⊗0640YD 30 (1.18) 32 640 (25.19) 2.0 (4.4)
440L-P2K⊗0800YD 440L-T2KA0800YD 440L-R2K⊗0800YD 30 (1.18) 40 800 (31.49) 2.5 (5.5)
440L-P2K⊗0960YD 440L-T2KA0960YD 440L-R2K⊗0960YD 30 (1.18) 48 960 (37.79) 2.9 (6.4)
440L-P2K⊗1120YD 440L-T2KA1120YD 440L-R2K⊗1120YD 30 (1.18) 56 1120 (44.09) 3.4 (7.5)
440L-P2K⊗1280YD 440L-T2KA1280YD 440L-R2K⊗1280YD 30 (1.18) 64 1280 (50.39) 3.8 (8.4)
440L-P2K⊗1440YD 440L-T2KA1440YD 440L-R2K⊗1440YD 30 (1.18) 72 1440 (56.69) 4.3 (9.5)
440L-P2K⊗1600YD 440L-T2KA1600YD 440L-R2K⊗1600YD 30 (1.18) 80 1600 (62.99) 4.7 (10.4)
440L-P2K⊗1760YD 440L-T2KA1760YD 440L-R2K⊗1760YD 30 (1.18) 88 1760 (69.29) 5.2 (11.5)
440L -P2K 0320 YD
Connector Option Micro QD
Environmental Rating IP65
0160 - Protective Height
0320
0480 0960 1440
0640 1120 1600
0800 1280 1760
K- 30 mm (1.18 in.)
Type 2
P - Pair, T - Transmitter, R - Receiver
Bulletin Number
⊗
Operating Modes
A = Guard Only
D = Restart Interlock with EDM

GuardShield™ Type 2 Safety Light Curtain Installation Instructions
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Dimensions [mm (in.)]
⊗A is guard only mode; D is restart interlock with EDM.
Type
A
Protective Height
B
Mounting Value
C
Total Length
440L-P2K⊗0160YD 160 ±0.5 285 321 ±1.5
440L-P2K⊗0320YD 320 ±0.5 445 481 ±1.5
440L-P2K⊗0480YD 480 ±0.5 605 641 ±1.5
440L-P2K⊗0640YD 640 ±0.5 765 801 ±1.5
440L-P2K⊗0800YD 800 ±0.5 925 961 ±1.5
440L-P2K⊗0960YD 960 ±0.5 1085 1121 ±1.5
440L-P2K⊗1120YD 1120 ±0.5 1245 1281 ±1.8
440L-P2K⊗1280YD 1280 ±0.5 1405 1441 ±1.8
440L-P2K⊗1440YD 1440 ±0.5 1565 1601 ±1.8
440L-P2K⊗1600YD 1600 ±0.5 1725 1636 ±2.0
440L-P2K⊗1760YD 1760 ±0.5 1885 1796 ±2.0
40
(1.57)
42
(1.65)
20
(0.79)
40
(1.57)
45
(1.77)
52
(2.05)
80 min
(3014)
11
(0.43)
A
B
C
440L-AF6108 Middle Mounting Bracket to be used in
vibration applications for units greater than 800mm
(31.4in)